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Bolts 5/16-18 x 1-3/4 G8 HXBT St-zn (Jar 100)
Features
- A cap screw made from medium carbon steel and heat-treated
- Used in automotive and fleet industries, where greater tensile strength is required than can be met by a Grade-5
Additional Notes
- Other sizes and quantities available by request
Manufacturer Resources
Product Specs
- Arra Compliant:
- C
- Buy American Compliant:
- C
- Division:
- Electrical H1
- Fastener Head Height:
- Jul-32 in.
- Fastener Head Type:
- Hex
- Fastener Head Width:
- 0.489 - 0.500 in.
- Fastener Height:
- 0.195 - 0.211
- Fastener Length:
- 1/3/04
- Fastener Width:
- 0.552 - 0.577
- Grade:
- 8
- Hardness:
- Rockwell C33-39
- Language Code:
- EN
- Material Standard:
- AISI 1021 - 1045
- Order Minimum Imperial:
- 100
- Order Minimum Uom Imperial:
- CT
- Outside Diameter:
- 0.3065 - 0.3125 IN
- Pack Type:
- Jar
- Product Group:
- Fasteners
- Product Height:
- 5.75 in
- Product Length:
- 3.5 in
- Product Weight:
- 2032 g
- Product Width:
- 88.9 MM
- Sub Division:
- Electrical-E H2
- Tensile Strength:
- 150000 psi minimum
- Thread Per Inch:
- 18
- Yield Strength:
- 130000 psi minimum
- Department:
- Electrical
- Product Subgroup:
- Bolts
- Product Type:
- Hexagonal Bolt
- Type2:
- Hexagonal Bolt
- Series:
- G8HC and JG8HC
- Product Finish:
- Zinc
- Product Details:
- Hexagonal Bolt
- Product Material:
- Steel
Metallics JG8HC413 – Frequently Asked Questions
1) What thread and size is the Metallics JG8HC413 hex bolt?
It's a 5/16-18 x 1-3/4 inch hex cap screw: 18 threads per inch on a 5/16 coarse (UNC) thread, with a measured shank diameter of 0.3065 to 0.3125 inch. Across the flats the head runs 0.489 to 0.500 inch, so a 1/2 inch wrench or socket fits it.
2) Is the zinc plating on these Grade 8 bolts enough for outdoor or wet use?
The JG8HC413 is medium carbon steel with a zinc finish. Zinc plating is a mild, indoor-to-sheltered corrosion coating, not a marine or constantly-wet solution. For equipment bays, chassis work, framing and general MRO it's fine; for standing water, coastal exposure or chemical washdown, specify a hot-dip galvanized or stainless fastener instead and size the strength accordingly, since stainless won't match Grade 8 tensile.
3) How many bolts come in a jar, and can I buy less than a full jar?
These ship 100 pieces in a jar, and 100 count is the order minimum, so the jar is the smallest buy. Metallics does offer other sizes and quantities on request if 5/16-18 x 1-3/4 isn't the length you need.
4) Does this Metallics bolt meet Buy American or ARRA requirements on a public job?
The JG8HC413 carries a Buy American compliant and ARRA compliant designation in the product record, with country of origin listed as China. On a federally funded project where the specification calls for domestic melt and manufacture, confirm which standard your contract is written to before you submit these, because the two are not the same test.
5) What steel are Metallics G8HC Grade 8 cap screws made from?
Medium carbon steel to AISI 1021-1045, heat treated to reach Grade 8 properties and finishing at Rockwell C33-39. That heat treatment is what you're paying for, and it's also why you should not weld, re-heat, or bend these in the field: it undoes the temper and drops the bolt well below its 150,000 psi rating.
How fast can I get the Metallics JG8HC413 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics JG8HC413 come with a warranty?
Absolutely. The Metallics JG8HC413 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics JG8HC413?
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